Inside Macintosh: QuickDraw GX Printing Extensions and Drivers /

Chapter 4 - Printing Messages / Printing Messages Reference

Constants and Data Types for the Raster Imaging System

Raster Offscreen Structure

The raster offscreen structure, of type gxOffscreenRec, contains an offscreen area for a bitmap.

struct gxOffscreenRec {
   short       numberOfPlanes;
   Handle      offscreenStorage;
   gxOffscreenPlaneRec
               thePlanes[1];
};
typedef struct gxOffscreenRec gxOffscreenRec, *gxOffscreenPtr, 
**gxOffscreenHdl;

Field Description

numberOfPlanes

The number of planes into which to draw the bitmap.

offScreenStorage

A handle to the bitmap's image data.

thePlanes

An array of plane structures into which to draw the data. Each element of this array is an offscreen plane structure, which is described in the next section.

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